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Question
Let n(A) 30, n(B) = 27 and n(A∪B) = 45, find: n(A - B).
Solution
n(A) = 30, n(B) = 27 and n(A ∪ B) = 45
We know that,
n(A-B) = n(A ∪B) – n(B)
n(A – B) = 45 – 27 = 18
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